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🦀 crates.io
Not in CISA KEV
HIGH severity

CVE-2019-15542 — ammonia

HIGH

CVE-2019-15542 is a high-severity (CVSS 7.5) CWE-674 vulnerability in ammonia. A fix is available for ammonia — see the affected versions and patch details below.

Uncontrolled recursion in ammonia

Also known asGHSA-5hp8-35wj-m525RUSTSEC-2019-0001
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.00%0.64%1.27%1.91%0.4%1.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🦀ammonia

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in the ammonia crate before 2.1.0 for Rust. There is uncontrolled recursion during HTML DOM tree serialization.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.ioammoniaall versions2.1.0cargo update -p ammonia --precise 2.1.0

Affected Products

1 product · 1 configurations
Application
ammoniaammonia_project
< 2.1.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ammonia, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ammonia to 2.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-15542 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

An issue was discovered in the ammonia crate before 2.1.0 for Rust. There is uncontrolled recursion during HTML DOM tree serialization.
O3 Security · Impact-Aware SCA

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CVE-2019-15542: ammonia — Fixed in 2.1.0